The theory of totally positive matrices and functions has its origins in work of Pólya (1913, 1915). Such matrices and functions were in- vestigated by I. Schoenberg in a series of beautiful papers starting in 1930. Much early history of the subject can be found in later papers of Schoenberg (1951, 1953).
KeywordsProbability Density Function Hazard Rate Positive Function Exponential Family Frequency Function
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